[BUG] Some generate options are not working for go specific generators

Description

Below options like:

1. --reserved-words-mappings
2. --language-specific-primitive
3. --instantiation-types
4. --type-mappings

doesn't do anything (when used) for all go generators:

1. Client: go
2. Server: go-gin-server
3. Server: go-server

Note: --import-mappings is working fine.

openapi-generator version

6.4.0 (https://repo1.maven.org/maven2/org/openapitools/openapi-generator-cli/6.4.0/openapi-generator-cli-6.4.0.jar)